<template>
  <div :style="getPlaceholderDomStyle" v-if="getIsShowPlaceholderDom"></div>
  <div :style="getWrapStyle" :class="getClass">
    <LayoutHeader v-if="getShowInsetHeaderRef" />
    <MultipleTabs v-if="getShowTabs" />
  </div>
</template>
<script lang="ts">
import { defineComponent, unref, computed, CSSProperties } from 'vue'

import LayoutHeader from './index.vue'
import MultipleTabs from '../tabs/index.vue'

import { useHeaderSetting } from '@/hooks/setting/useHeaderSetting'
import { useMenuSetting } from '@/hooks/setting/useMenuSetting'
import { useFullContent } from '@/hooks/web/useFullContent'
import { useMultipleTabSetting } from '@/hooks/setting/useMultipleTabSetting'
import { useAppInject } from '@/hooks/web/useAppInject'
import { useDesign } from '@/hooks/web/useDesign'
import { useLayoutHeight } from '../content/useContentViewHeight'

const HEADER_HEIGHT = 48

const TABS_HEIGHT = 32
export default defineComponent({
  name: 'LayoutMultipleHeader',
  components: { LayoutHeader, MultipleTabs },
  setup() {
    const { setHeaderHeight } = useLayoutHeight()
    const { prefixCls } = useDesign('layout-multiple-header')

    const { getCalcContentWidth, getSplit } = useMenuSetting()
    const { getIsMobile } = useAppInject()
    const {
      getFixed,
      getShowInsetHeaderRef,
      getShowFullHeaderRef,
      getHeaderTheme,
      getShowHeader,
    } = useHeaderSetting()

    const { getFullContent } = useFullContent()

    const { getShowMultipleTab } = useMultipleTabSetting()

    const getShowTabs = computed(() => {
      return unref(getShowMultipleTab) && !unref(getFullContent)
    })

    const getIsShowPlaceholderDom = computed(() => {
      return unref(getFixed) || unref(getShowFullHeaderRef)
    })

    const getWrapStyle = computed((): CSSProperties => {
      const style: CSSProperties = {}
      if (unref(getFixed)) {
        style.width = unref(getIsMobile) ? '100%' : unref(getCalcContentWidth)
      }
      if (unref(getShowFullHeaderRef)) {
        style.top = `${HEADER_HEIGHT}px`
      }
      return style
    })

    const getIsFixed = computed(() => {
      return unref(getFixed) || unref(getShowFullHeaderRef)
    })

    const getPlaceholderDomStyle = computed((): CSSProperties => {
      let height = 0
      if (
        (unref(getShowFullHeaderRef) || !unref(getSplit)) &&
        unref(getShowHeader) &&
        !unref(getFullContent)
      ) {
        height += HEADER_HEIGHT
      }
      if (unref(getShowMultipleTab) && !unref(getFullContent)) {
        height += TABS_HEIGHT
      }
      setHeaderHeight(height)
      return {
        height: `${height}px`,
      }
    })

    const getClass = computed(() => {
      return [
        prefixCls,
        `${prefixCls}--${unref(getHeaderTheme)}`,
        { [`${prefixCls}--fixed`]: unref(getIsFixed) },
      ]
    })

    return {
      getClass,
      prefixCls,
      getPlaceholderDomStyle,
      getIsFixed,
      getWrapStyle,
      getIsShowPlaceholderDom,
      getShowTabs,
      getShowInsetHeaderRef,
    }
  },
})
</script>
<style lang="less" scoped>
@prefix-cls: ~'@{namespace}-layout-multiple-header';

.@{prefix-cls} {
  transition: width 0.2s;
  flex: 0 0 auto;

  &--dark {
    margin-left: -1px;
  }

  &--fixed {
    position: fixed;
    top: 0;
    z-index: @multiple-tab-fixed-z-index;
    width: 100%;
  }
}
</style>
